考點(diǎn):整數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)先算除法,再算加法;
(2)把32=8×4,利用乘法結(jié)合律簡(jiǎn)算;
(3)利用加法交換律與結(jié)合律簡(jiǎn)算;
(4)利用乘法分配律簡(jiǎn)算;
(5)先算乘法,再算加法;
(6)利用除法的性質(zhì)簡(jiǎn)算.
解答:
解:(1)175+25÷25+15
=175+5+15
=195;
(2)125×32×25
=125×8×(4×25)
=1000×100
=100000;
(3)37+125+63+175
=37+63+(175+125)
=100+300
=400;
(4)324+99×324
=(1+99)×324
=100×324
=32400;
(5)132+37+37×68
=169+2516
=2685;
(6)3200÷25÷4
=3200÷(25×4)
=3200÷100
=32.
點(diǎn)評(píng):整數(shù)混合運(yùn)算的關(guān)鍵是抓住運(yùn)算順序,正確按運(yùn)算順序計(jì)算,適當(dāng)利用運(yùn)算定律簡(jiǎn)算.